For the LORD has poured out on you a spirit of deep sleep. He has shut your eyes, O prophets; He has covered your heads, O seers.
10. Because Jehovah hath overpowered you with the spirit of slumber. For the purpose of shewing more clearly the source of this blindness, he attributes it to the judgment of God, who determined to punish in this manner the wickedness of the people.
Here, I. The prophet stands amazed at the stupidity of the greatest part of the Jewish nation. They had Levites, who taught the good knowledge of the Lord and had encouragement from Hezekiah in doing so, Ch2 30:22. They had prophets, who brought them messages immediately from God, and signified to them what were the causes and what would be the effects of God's displeasure against them.
Commenting on Isaiah 29:9-16
For the Lord hath poured out upon you a spirit of deep sleep,.... Gave them up to a stupid frame of spirit; to a reprobate mind, a mind void of judgment and sense; to judicial blindness and hardness of heart: this was remarkably fulfilled in the Jews, in the times of Christ and his apostles, who choosing darkness rather than the light of the Gospel...